An administrator is in the process of deploying a new ESXi host. - The host is able to be added to the vCenter Server's inventory, but after a short period of time it shows as disconnected. - The admi

Port 902 UDP is used by ESXi hosts to send heartbeat signals to vCenter Server. When this port is blocked outbound from the host, vCenter receives no heartbeats and marks the host as disconnected after the timeout period expires, producing the exact repeat-disconnect symptom described.

Port 443 TCP is used for vCenter management API communication; if blocked from the host, the host could not be added to inventory at all, not just periodically disconnected.

Port 902 TCP is used for VM provisioning traffic such as file copies and console access, not for the continuous heartbeat mechanism that maintains host connectivity status.

Port 443 TCP from vCenter to the host handles management operations, but the periodic disconnect symptom specifically points to failed outbound heartbeats from the host, not inbound management traffic.